Rule
Dark Skies
Zermatt - Dark Skies - Alps
Zermatt, Valais, Switzerland
Moonless nights with crystal-clear skies for deep-sky photography
Upcoming Opportunities
When all conditions match, PhotoWeather marks an opportunity window.
Times shown in Europe/Zurich
Next opportunity
Pristine Dark Skies (pristine)
Zermatt
Sun, Feb 22 · 03:00–05:00 · 2h window
Low confidence
30%
🌛Moon Altitude-27.8--26°
☁️Total Cloud Coverage5%
Good Dark Skies
Zermatt
Sun, Feb 22 · 05:00–05:40
🌛Moon Altitude:-26.8°
Medium
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72-hour requirements breakdown
What passed or failed, hour by hour0matching hours in the next 95 hours
OR logic: one branch per group is enough
Meets requirement
Misses requirement
Time Europe/Zurich | Astronomical Night Any | Total Cloud Coverage ≤ 20.0% | Visibility ≥ 12000.0m | Precipitation Chance ≤ 10.0% | Moon Illumination OR1·B1≤ 35.0% | Moon Altitude OR1·B2≤ 10.0° |
|---|---|---|---|---|---|---|
| Mon, Feb 16 | ||||||
| 14:00 | ✕ | 100% | 126m | 100% | 1.2% | 21° |
| 15:00 | ✕ | 100% | 138m | 100% | 1.2% | 15° |
| 16:00 | ✕ | 100% | 95m | 100% | 1.2% | 7.2° |
| 17:00 | ✕ | 100% | 171m | 100% | 1.2% | -1.4° |
| 18:00 | ✕ | 100% | 132m | 100% | 1.2% | -11° |
| 19:00 | ✓ | 100% | 122m | 100% | 1.2% | -21° |
| 20:00 | ✓ | 100% | 121m | 100% | 1.2% | -31° |
| 21:00 | ✓ | 100% | 135m | 100% | 1.2% | -40° |
| 22:00 | ✓ | 100% | 102m | 100% | 1.2% | -49° |
| 23:00 | ✓ | 100% | 119m | 100% | 1.2% | -56° |
| Tue, Feb 17 | ||||||
| 24:00 | ✓ | 100% | 106m | 100% | 1.2% | -59° |
| 01:00 | ✓ | 100% | 134m | 100% | 0% | -58° |
| 02:00 | ✓ | 100% | 87m | 100% | 0% | -53° |
| 03:00 | ✓ | 100% | 156m | 100% | 0% | -45° |
| 04:00 | ✓ | 100% | 102m | 100% | 0% | -36° |
| 05:00 | ✓ | 100% | 136m | 100% | 0% | -26° |
| 06:00 | ✕ | 100% | 137m | 100% | 0% | -16° |
| 07:00 | ✕ | 100% | 131m | 100% | 0% | -5.6° |
| 08:00 | ✕ | 100% | 103m | 100% | 0% | 4.1° |
| 09:00 | ✕ | 100% | 107m | 100% | 0% | 13° |
| 10:00 | ✕ | 100% | 136m | 100% | 0% | 21° |
| 11:00 | ✕ | 100% | 162m | 100% | 0% | 27° |
| 12:00 | ✕ | 100% | 150m | 100% | 0% | 30° |
| 13:00 | ✕ | 100% | 244m | 100% | 0% | 31° |
| 14:00 | ✕ | 99% | 1215m | 82% | 0% | 29° |
| 15:00 | ✕ | 96% | 2385m | 64% | 0% | 25° |
| 16:00 | ✕ | 92% | 2618m | 46% | 0% | 18° |
| 17:00 | ✕ | 62% | 5049m | 44% | 0% | 9.9° |
| 18:00 | ✕ | 96% | 349m | 41% | 0% | 0.76° |
| 19:00 | ✓ | 97% | 313m | 39% | 0% | -8.9° |
| 20:00 | ✓ | 97% | 656m | 26% | 0% | -19° |
| 21:00 | ✓ | 96% | 4972m | 13% | 0% | -29° |
| 22:00 | ✓ | 50% | 13415m | 0% | 0% | -38° |
| 23:00 | ✓ | 25% | 22422m | 8.7% | 0% | -46° |
| Wed, Feb 18 | ||||||
| 24:00 | ✓ | 4.8% | 24134m | 17% | 0% | -51° |
| 01:00 | ✓ | 7.2% | 24135m | 26% | 1.2% | -54° |
| 02:00 | ✓ | 19% | 24134m | 36% | 1.2% | -52° |
| 03:00 | ✓ | 93% | 24135m | 46% | 1.2% | -46° |
| 04:00 | ✓ | 97% | 24135m | 56% | 1.2% | -39° |
| 05:00 | ✓ | 98% | 24134m | 55% | 1.2% | -29° |
| 06:00 | ✕ | 98% | 22762m | 54% | 1.2% | -19° |
| 07:00 | ✕ | 100% | 10941m | 52% | 1.2% | -9° |
| 08:00 | ✕ | 98% | 1904m | 48% | 1.2% | 1.2° |
| 09:00 | ✕ | 28% | 24134m | 44% | 1.2% | 11° |
| 10:00 | ✕ | 24% | 24135m | 39% | 1.2% | 20° |
| 11:00 | ✕ | 42% | 24135m | 39% | 1.2% | 28° |
| 12:00 | ✕ | 45% | 24134m | 39% | 1.2% | 34° |
| 13:00 | ✕ | 69% | 15366m | 39% | 1.2% | 37° |
| 14:00 | ✕ | 78% | 1256m | 26% | 1.2% | 37° |
| 15:00 | ✕ | 89% | 1491m | 13% | 1.2% | 34° |
| 16:00 | ✕ | 100% | 5637m | 0% | 1.2% | 29° |
| 17:00 | ✕ | 100% | 3094m | 19% | 1.2% | 21° |
| 18:00 | ✕ | 100% | 649m | 37% | 1.2% | 13° |
| 19:00 | ✓ | 100% | 1037m | 56% | 1.2% | 3.1° |
| 20:00 | ✓ | 100% | 971m | 62% | 1.2% | -6.7° |
| 21:00 | ✓ | 100% | 1403m | 69% | 1.2% | -17° |
| 22:00 | ✓ | 100% | 2823m | 75% | 1.2% | -26° |
| 23:00 | ✓ | 100% | 3073m | 84% | 1.2% | -35° |
| Thu, Feb 19 | ||||||
| 24:00 | ✓ | 100% | 3817m | 92% | 1.2% | -42° |
| 01:00 | ✓ | 100% | 3138m | 100% | 4.5% | -46° |
| 02:00 | ✓ | 100% | 1586m | 95% | 4.5% | -47° |
| 03:00 | ✓ | 100% | 1370m | 90% | 4.5% | -45° |
| 04:00 | ✓ | 100% | 9162m | 85% | 4.5% | -39° |
| 05:00 | ✓ | 100% | 329m | 89% | 4.5% | -31° |
| 06:00 | ✕ | 100% | 92m | 93% | 4.5% | -22° |
| 07:00 | ✕ | 100% | 203m | 97% | 4.5% | -12° |
| 08:00 | ✕ | 100% | 124m | 93% | 4.5% | -1.8° |
| 09:00 | ✕ | 100% | 145m | 90% | 4.5% | 8.4° |
| 10:00 | ✕ | 100% | 142m | 86% | 4.5% | 18° |
| 11:00 | ✕ | 100% | 208m | 90% | 4.5% | 27° |
| 12:00 | ✕ | 100% | 823m | 94% | 4.5% | 35° |
| 13:00 | ✕ | 100% | 4963m | 98% | 4.5% | 41° |
| 14:00 | ✕ | 100% | 4265m | 97% | 4.5% | 44° |
| 15:00 | ✕ | 100% | 10038m | 97% | 4.5% | 43° |
| 16:00 | ✕ | 100% | 5676m | 96% | 4.5% | 39° |
| 17:00 | ✕ | 100% | 2968m | 97% | 4.5% | 33° |
| 18:00 | ✕ | 100% | 1500m | 97% | 4.5% | 25° |
| 19:00 | ✓ | 100% | 1003m | 98% | 4.5% | 15° |
| 20:00 | ✓ | 100% | 704m | 96% | 4.5% | 5.6° |
| 21:00 | ✓ | 100% | 405m | 94% | 4.5% | -4.3° |
| 22:00 | ✓ | 100% | 106m | 92% | 4.5% | -14° |
| 23:00 | ✓ | 99% | 268m | 94% | 4.5% | -23° |
| Fri, Feb 20 | ||||||
| 24:00 | ✓ | 97% | 430m | 95% | 4.5% | -31° |
| 01:00 | ✓ | 96% | 592m | 96% | 10% | -37° |
| 02:00 | ✓ | 97% | 610m | 87% | 10% | -40° |
| 03:00 | ✓ | 99% | 628m | 78% | 10% | -40° |
| 04:00 | ✓ | 100% | 646m | 68% | 10% | -37° |
| 05:00 | ✓ | 99% | 3256m | 69% | 10% | -31° |
| 06:00 | ✕ | 98% | 5867m | 69% | 10% | -24° |
| 07:00 | ✕ | 97% | 8477m | 69% | 10% | -15° |
| 08:00 | ✕ | 98% | 6160m | 64% | 10% | -4.8° |
| 09:00 | ✕ | 99% | 3843m | 59% | 10% | 5.4° |
| 10:00 | ✕ | 100% | 1526m | 54% | 10% | 16° |
| 11:00 | ✕ | 99% | 1264m | 57% | 10% | 26° |
| 12:00 | ✕ | 99% | 1003m | 60% | 10% | 35° |
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity). For OR groups, only one branch is required, so some OR-branch predicates can be ✕ even in a matching hour.
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